de Jesus A.,Federal University of Rio Grande do Sul | Sturgeon R.E.,National Research Council Canada | Liu J.,Beijing Titan Instruments Company | Silva M.M.,Federal University of Rio Grande do Sul | Silva M.M.,Brazilian National Council for Scientific and Technological Development Microchemical Journal | Year: 2014

The Ultraviolet pretreatment device in the present invention relates to an interface technique in the field of coupling technology for the analysis of chemical element species. The objective is to provide an Ultraviolet pretreatment device with simple structure, enhanced UV illuminance, and high digestion efficiency. The Ultraviolet pretreatment device in the present invention comprises a low pressure Mercury lamp and a quartz tube, wherein, the low pressure Mercury lamp comprises a lamp tube, electrodes and a power source. The quartz tube is located within the lamp tube, the two ends of the quartz tube are fixedly and respectively joined with the tube wall of the lamp tube, the inner wall of the lamp tube and the outer wall of the quartz tube form a sealed gas chamber, and the electrodes are located in the gas chamber.

Volatile phenolics in ground water were determined by using flow injection analysis. The detection limit was 0.89 μg/L and the liner range was 0.002-0.1 mg/L (r≤ 0.999). The relative standard deviation was 1%-5%. The throughput was 18/h. The interferences of the coexisted ions were studied. Usually, the positive interference was resulted by the sulfide in ground which leads to the error result. To add H3PO4 into the sample can remove most of the sulfide disruptors and add CuSO4 can remove sulfide left in the sample.
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